Start-Up; Maintenance - Grundfos LCD 108 Installations- Und Bedienungsanleitung

8. Start-up

Warning
Before starting any work on pumps used to pump
liquids which could be constituted as being
hazardous to health, thorough cleaning/venting
of pumps, pits, etc. must be carried out
according to local regulations.
Before making any connections in the LCD 108 or
work on pumps, pits, etc., it must be ensured that
the electricity supply has been switched off and
that it cannot be accidentally switched on.
Prior to start-up, the connection and DIP switch setting must have
been carried out according to sections
Start-up must be carried out by authorized personnel.
Proceed as follows:
1. Check whether the float switches have been connected
according to the wiring diagram for the actual application.
2. Check that the pump inlets are submerged in the liquid to be
pumped.
3. Set the motor protection relays to the rated current stated on
the nameplates.
4. Warning:
Warning
Set the motor-protective circuit breakers to the
rated current stamped on the nameplates
according to the values in the table.
Conversion table for motor protection relay setting
I
N
10
13
17
22
28
36
46
60
77
100
5. Switch on the electricity supply.
Three-phase pumps only: Check for wrong phase sequence
(only certain variants), (the pump cannot be started if the
phase sequence is wrong!).
6. Start the pumps, see section 4.5, 5.5,
7. Check that the pumps are not running dry. The risk of dry
running can be eliminated by a renewed time setting by
means of the DIP switch according to section 4.2, 5.2,
7.2 and/or by moving the float switches.
8. Three-phase pumps only: Check whether the direction of
rotation of the pumps is correct according to the installation
and operating instructions for the pump in question.
9. Select the required operating mode by means of the ON-OFF-
AUTO selector switch, see section 4.5, 5.5,
24
4. to 7.
I I
DOL star-delta
10 5.8
13 7.5
17 9.6
22 12.4
28 16.1
36 20.7
46 26.8
60 34.6
77 44.7
100 57.7
6.5 or 7.5.
6.2
6.5 or 7.5.

9. Maintenance

Warning
Before starting any work on pumps used to pump
liquids which could be constituted as being
hazardous to health, thorough cleaning/venting
of pumps, pits, etc. must be carried out
according to local regulations.
Before making any connections in the LCD 108 or
work on pumps, pits, etc., it must be ensured that
the electricity supply has been switched off and
that it cannot be accidentally switched on.
During normal application and operation, the controller LCD 108
is maintenance-free.
However, it is advisable to carry out minor checks of the LCD 108
controller, pump pits, tanks, pumps, etc. at suitable intervals.
These checks should be carried out by authorized personnel.
• Check the gaskets of the LCD 108 cabinet front and those of
the Pg cable entries.
• Check the cable entries for the explosion hazard area.
• Check for possible deposits/sludge build-up in the pump pit/
tank. Sludge may settle in areas with almost stagnant liquid.
• Check for beginning sludge build-up around the float switches.
• Check for possible blockage on the suction side of the pump.
A blockage will typically be a large solid object.
• If the LCD 108 has been installed in a particularly aggressive
environment, it is advisable to check the motor protection
contacts in order to identify possible chemical attack resulting
in corrosion. In typical installations, the motor protection
contacts will work for several years and do not require any
inspection.
The list above is not complete. The LCD 108 may
be installed in systems, installations and/or
Note
environments which require thorough and
regular maintenance.
or